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The damper switch (second link) and the damper adapter (third link) are, I am nearly certain, the same part. The observation that the printer switches between black and matte suggests that the switch is good..... unless these switches wear out with a subsequent air leak when in the PK position...

Rhayader. Don't give up! Be extremely careful with water falling. Are you using the 20 drop Pharmacist concoction? I suggest that you continue to ammonia fume the head. Ammonia is corrosive but, you don't have much to lose. Further, if you decide to remove the head and clean it off-board; I have...

Update and background summary. It seems that my SCP-600 suddenly developed ink delivery problems at several locations in the ink delivery system. The printer went from printing perfectly (so I thought) to being unusable following an ink charge aimed at one channel (PK) that appears to have...

I have an ET-8550 in the box on the shelf. I have an SCP-600 that I may not be able to repair. I need to make a decision about unboxing the ET-8550 in the coming weeks. The P600 has perfect nozzle checks for LLK, LK, and PK (and presumably MK). Thus, I am currently using the P600 for B/W...

Update. I have had a boxed ET-8550 sitting in the corner for a few weeks now. I am avoiding opening the box because I have not given up on the SCP-600. I know that if I put the 8550 into operation; I may give up on the P-600. Ultimately, I much prefer to have a working P-600 over the 8550. And...

Rad, The dampers I just received for the 3800, after waiting 2 weeks, are not correct for my SCP-600. I gambled that the 3800 and P-600 used the same dampers. I lost that gamble. They are too high. Very close to compatible, but no cigar. Thus, I am back to reconditioning my existing dampers. I...

Just so you know, years ago, I have needlessly, accidentally, and permanently, destroyed a number of R2880s. Thus, my credentials indicate that my expertise is of limited value. You removed the air vent covering on the new cartridge?

I have similar problems with a SCP-600. Before you give up; I would swap in a new damper for the LLK channel. The 3800, as I understand it, uses the same dampers as the SCP-600. They are available on EBay at about 32.00USA for a set of 6. I received a set yesterday, but it will be a few days...

Update: I can't believe how much I think I may have learned. The PA600 still has 3 channels - Y/LC/C that are essentially dead. Perfect nozzle checks in the others. Nonetheless, I still have hope that I can fix it. It was a mistake to install a new damper assembly on the old head stage...

I completely tore down a P600 damper assembly from the original ink delivery system. I wanted to know if the two dampers mounted nearest the PK/MK switch were same part as the other three dampers. They are. Removing these two dampers unlike the other three, requires disassembly of the damper...

I have learned much in the last day. Your prediction that the damper filters were clogged is apt to be the most correct. As you know, I was working on replacing the capping station. This was not easy. You have about 1/32" to work with to drop the old and replace with the new. This took hours of...

Thanks for the information regarding the sponge on the left. I did not realize that it was separate. I just tried to remove it using plastic trim tools. The sponge is so gummed up that I can't remove it as a single piece. It tears in layers. Thus, I quit trying to remove it for fear of removing...

I quickly realize that cleaning the waste padding is futile. Not even denatured alcohol dissolves the solidified ink on the schedule that I am up against. I may plan on a second tear down to replace the padding under the left carriage area. I have looked for padding for the P600/R300 over the...

My preparation has, thus far, paid off. I determined the least invasive way to remove the bottom base. The new capping station is installed. No loose ends; no broken or extra parts. All fasteners accounted for. Although, I have to say, not for the faint of heart. Apropos of your comment...

Point well taken regarding the risk of tear down. Thank you. I have cleaned the left side of the carriage area on a routine basis over the years. As you no doubt know, an external waste tank does not drain this area. I have been studying the tear down for replacing the capping station. It seams...

Ahhhhh. I think you helped me to understand how what appears to be a one-way valve against the ink path flow may be gated. As described in the original post, I replaced the original ink delivery with an assembly that I put on the shelf for backup. I bought the spare assembly from a company in...

Thank you for your suggestions. I tested dampers that I removed from the P600 damper assembly and they easily flowed water from the inlet to the outlet. I did not test from the outlet to the inlet but based on your comment, I would likely have noticed a resistance to flow of water in the reverse...

Thank you for the encouragement. LOL I have noticed that there are convoluted ink paths in the tank base that are fed by the ink cartridge. My uninformed suspicion is that they perform some sort of dampening and may be a "functional" one-way valve. Or instead, perhaps I replaced the original ink...

Thank you for the link. The TOC indicates that the focus is mainly on the print head and not so much on external ink flow. Nonetheless, I wish I had read this article two decades ago when I first started fiddling with inkjet repair. Despite that this is Sunday, I have to head to my day job. I...

Background. Failing to abide by Jose's primary instruction to maintain ink cartridges at half full or more, I let a PK cartridge run dry. Thus. air entered the PK line and the channel quit printing. I am embarrassed to confess, this was a repeat offense. I committed the same heinous crime in...